diff --git a/Command-Line-Interface.md b/Command-Line-Interface.md
index e96da3a..2e722df 100644
--- a/Command-Line-Interface.md
+++ b/Command-Line-Interface.md
@@ -22,6 +22,8 @@ Starting Calibre-Web with `-k "" -c ""`, deactivates the ssl-server, it falls ba
 
 Calibre-Web supports the following Environmental variables.
 
+`SECRET_KEY` sets the key to encrypt cookies (if not set calibre-web will generate a random key on it's own)
+`COOKIE_PREFIX` adds a prefix to the session cookies, so it doesn't interfere with session cookies on the same server
 `CALIBRE_DBPATH` allows to set the home directory for Calibre-Web's settings files (`app.db`, `calibre-web.log`, `gdrive.db`)\
 `CALIBRE_PORT` allows to set the default listening port during creation of the settings database. Afterwards the port which is configured in the UI, is used.\
 `CALIBRE_RECONNECT` enables the reconnect endpoint (`<hostname>/reconnect`) which will attempt to reconnect the database\